Document cancelled with number &, must be cleared manually (& &)

What causes this issue?

Invoice successfully cancelled. The reversal document has the number
&V1&. The system could not fully clear the item automatically. This can
have two causes:
If the original document contains more than one supplier line, the
system only clears the first supplier line.
When the system attempted to clear the first line, errors occurred (see
error message &V2& &V3&).

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check if the first supplier line has been cleared.
Try clearing the lines that have not been cleared manually.
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Error message extract from SAP system. Copyright SAP SE.